Protector for electric lamps.



G. F. VENN.

PROTECTOR FOR ELECTRIC LAMPS.

APPLICATION FILED AUG-24. I918.

Patented Jan. 21, 1919.

BYZ

GEORGE FRANCIS VENN, OF OTTAWA, ONTARIO, CANADA.

PROTECTOR FOR ELECTRIC LAMPS.

Specification of Letters Patent.

Patented Jan. 21, 1919.

Application filed August 24, 1918. Serial No. 251,270.

To all whom it may concern:

Be it known that I, GEORGE FnANoIs VENN, a subject of the King of Great Britain, and resident of the city of Ottawa, Province of Ontario, Dominion of Canada, have invented certain new and ,useful Improvements in Protectors for Electric Lamps, of which the following is a specification.

This invention relates to improvements in protectors for electric lamps, and the objects of the invention are to prevent breakage of the bulb or globe of the lamp, to permit of the protecting means being attached to lamps at present in use with a minimum of time and labor, to so construct the protecting means that it will not materially add to the cost of the lamp and generally to adapt the protecting means to better perform the functions required of it.

With the above and other objects in, view, the invention consists essentially of the improved construction particularly described and set forth in the following specification and accompanying drawings forming part of the same.

In the drawings:

Figure 1 is a front elevation partly sectional of an electric lamp showing the improved protecting means mounted on the nipple of the bulb or globe.

Fig. 2 is a front elevation of an alternative form of lamp with the improved protecting means mounted on the nipple thereof.

Like characters of reference refer to like parts in the several figures.

Referring to the drawings A represents an electric bulb of any usual description, on the nipple of which the protecting means 10 is mounted.

This protecting means consists of a cement comprising a. mixture of silica, asbestos, Water glass, and fire day with the coloring matter, which cement is molded into the form of a pyramid and envelops the point of the nipple of the globe A.

The above ingredients are mixed in predetermined proportion and may be kept in a semi-plastic state in a closed container and used when found necessary on the bulbs or globes.

One of the principal characteristics which should not be overlooked is that the cement increasesin hardness as the heat of the lamp increases, so that the protecting pyramid 10 is of a sufficient hardness to withstand any impact on other articles.

The uses of a globe or lamp protected in this manner are infinite but one of the principal uses is in machine shops especially Where shells or other like articles are being manufactured and where inspection of the interior is to be made.

I have found that when dropping the lamp A into the interior of a shell that the nipple of the globe invariably impacts with the bottom or side of the shell and the globe fractures, but, by providing this protecting means 10 on the nipple, the force of the impact is not localized on the nipple so that the fracture or breakage is extremely unlikely to take place, and I have eflected a saving in lights of about 50% by the adaptation of this device.

This protecting means may also be used on extension lights or drop lights, which on being lowered are liable to impact with other objects and s break. The protecting means 10 does not distract from the appearance of the globe orlight.

As many changes could be made in the above construction and many apparently widely different embodiments of my invention within the scope of the claim con structed without departing from the spirit or scope thereof, it is intended that all matter contained in the accompanying specification and drawing shall be interpreted as illustrative and not in a limiting sense.

What I claim as my invention is:

The combination in an electric lamp globe and with the nipple thereof, of protecting means consisting of a body of cement 'enveloping the nipple and of material adapted to set and increase in hardness as heat is applied to the lamp, said cement body forming substantially an integral thickened extension of the wall of the globe surrounding the nipple, substantially as described.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

GEORGE FRANCIS VENN.

Witnesses:

JAMES MITCHELL, MARY E. KNox.

Copies 0! this patent may be obtained for five cents each, by addressing the Commissioner of ratenw, Washington, D. 0. 

